For what it's worth, Ed, I'm glad you went with the full resolution photos on this one. When Photosynth introduces dense reconstruction this synth will shine all the more.

If you know someone who has a computer with obscene amounts of RAM, you should try the original photos in Yasutaka Furukawa's PMVS2 by using Henri Astre's PhotosynthToolkit. If you don't have the originals anymore, you can download original resolution copies of the photos with Henri's PhotosynthTileDownloader.